conoptics 25d User manual

ConOptics, Inc. 19 Eagle Road, Danbury, CT 06810 Phone [phone] Fax [phone]
Email: [e-mail], or visit www.conoptics.com
1
Model 25D Manual
Introduction:
The Model 25D drive electronics is a high voltage push-pull power amplifier capable of output
voltage swings in the order of 175v P-P, push-pull. The Model 25D provides output rep rates
from DC-30MHz and typical rise and fall times of 8ns.

ConOptics, Inc. 19 Eagle Road, Danbury, CT 06810 Phone [phone] Fax [phone]
Email: [e-mail], or visit www.conoptics.com
2
Specifications:
Rise and Fall Time:
<8ns (Typical with most Electro-Optic Modulators)
Output Voltage Swing:
>175v P-P push-pull. (Output Voltage is adjustable from
approximately, 140v to 15v by front panel control)
Output Impedance:
100 Ohm Balanced Line
Bias Voltage:
Continuously adjustable between +/- 550v DC by front panel control
Input Signal:
Either TTL Compatible or Unipolar 0-1V, selectable by internal switch
on driver assembly
Input Impedance:
50 ohms, either mode
Input AC Power:
100VAC to 240VAC 50/60Hz. Set by internal push-pin selectable and
is set at time of shipment.
Cooling:
Forced air-cooling. (Total dissipation approx. 350W).
Dimensions:
The dimensions are 45cm W x 44cm L x 17.5cm H.
The weight is 32lbs
Environmental
Conditions:
Typical lab use.

ConOptics, Inc. 19 Eagle Road, Danbury, CT 06810 Phone [phone] Fax [phone]
Email: [e-mail], or visit www.conoptics.com
3
Technical Overview:
The Model 25D has a maximum output of 175v p-p. The output stage is the only saturating part
of the amplifier. Although the amplifier accepts standard TTL drive levels as its input, the entire
amplifier with the exception of the output stage is linear. At the very input of the amplifier, a
switch allows the user to select either TTL or low level Analog as its required input format.
TTL Input: (Logic high >+2v, <+4.5v, Logic low <+.8v)
This input mode employs a S140 line driver as a buffer between the input signal entering the
system and the power amp. This allows the user some latitude on logic highs and lows at the
input. As the input section of the amplifier is linear, care must be taken not to drive this section
of the amplifier into saturation and cutoff. By virtue of an on-board line driver, the actual input
signals may be rather poor and still the internal line driving gate delivers the required signal to
the amplifier.
Analog Input:
This input mode is included to allow operation of the Model 25D with the Model 305
Synchronous Countdown. The Model 305 outputs a 0 to +1v, high-speed analog pulse which is
used to operate the Model 25D in the “Pulse-Picking” mode. The Analog input should only be
selected when driven by the Model 305.
Note:
For most applications the TTL input mode is selected. The only exception is when the Model
25D is configured with the Model 305 Synchronous Countdown for use as a Pulse Picker. In
either configuration the input impedance is 50 ohms.
All signal levels should be checked with an oscilloscope with the signal terminated
in 50 ohms before applying to the driver input.
Care should be taken when using a function generator or pulse generator as
output levels from these instruments can easily exceed the max Vih allowed for
the S140 buffer in the driver.

ConOptics, Inc. 19 Eagle Road, Danbury, CT 06810 Phone [phone] Fax [phone]
Email: [e-mail], or visit www.conoptics.com
4
Pulse Selection:
The Analog Mode is selected and configured at the factory when mated to the Model 305. The
pulse width from the Analog out of the M305 and the M25D is fixed at approximately 18ns. If
the driver is to be used for wider pulse widths, an external pulse generator may be used with
adjustable pulse widths and rep rates. The driver is completely DC coupled and will accept any
pulse format from DC to 30MHz. The min/max pulse width is determined by setting of the
pulse generator.
Controls and Indicators:
Drive Voltage control allows the end-user to set the P-P output of the amplifier to the proper
level for the modulator and the wavelength of operation. Limits are 175v max and 138v min.
This is typically set by the user while monitoring the detected output of the system with an
oscilloscope.
Bias Voltage Adjustment control allows the end user to set the static DC bias on the modulator
which sets the quiescent optical operating point. For example, when the system is being used
as a high-speed shutter, the user might set the throughput intensity of the system to minimum
at logic low input level. Then, when the input signal goes to logic high, maximum throughput
intensity is obtained. The inverse may be obtained by setting the Bias at maximum
transmission with logic low input. Then when the input goes high, minimum transmission is
obtained.
Bias Voltage Meter is an analog volt meter that indicates the actual differential bias voltage
applied to the modulator. This voltage is not referenced to ground but is to the internal
electrodes of the modulator. Bias voltage range is approximately, +/- 400vDC.

ConOptics, Inc. 19 Eagle Road, Danbury, CT 06810 Phone [phone] Fax [phone]
Email: [e-mail], or visit www.conoptics.com
5
Equipment Installation:
The Model 25D amplifier is designed for typical surface mounting. The rear panel mains
connector provides a ground for earthing the chassis. A power cord is included with the
system. When installing ensure that the top cover and rear panel are not blocked. A minimum
of 6” behind the rear panel should be available for proper air flow. Proper cable routing is a
best practice for Power Cord, Input Signal Cable and J1, J2, J3 Modulator Connector Cables.
The integrity of unit may be impaired if used in a manner not intended or specified by
Conoptics.
Equipment Maintenance and Service:
The Model 25D includes a 1-year Warranty on all parts and labor. The unit is not field
serviceable. If a fault issue does arise it is important to shut the system down and immediately
contact Conoptics service department at [email protected].
It is important to use properly rated mains power supply cord. Improperly rated power
cord may cause overheating of the power cord.
Fuse Info: The Model 25D incorporates a Series 326 Little Fuse Ceramic 3AB Slow Blow.

ConOptics, Inc. 19 Eagle Road, Danbury, CT 06810 Phone [phone] Fax [phone]
Email: [e-mail], or visit www.conoptics.com
6
Model 25D Input Signal Format Selection Switch (S1):
Up Position sets the input of the driver to accept a 0 to +1V input signal. Input impedance 50
ohms. The “UP” position is used for Pulse Selection Systems where the system is configured to
include a Model 305 Synchronous Countdown.
Down Position sets the input of the driver to accept a TTL logic level at the input connector on
the rear panel. Input impedance is 50 ohms.
Note:
To change the input format switch, remove the top cover on the Model 25D driver electronics
while the system is powered off.

ConOptics, Inc. 19 Eagle Road, Danbury, CT 06810 Phone [phone] Fax [phone]
Email: [e-mail], or visit www.conoptics.com
7
Model 25D Connection Diagram for Pulse Selection System (Analog Setting)

ConOptics, Inc. 19 Eagle Road, Danbury, CT 06810 Phone [phone] Fax [phone]
Email: [e-mail], or visit www.conoptics.com
8
Model 25D Connection Diagram to Pulse Generator (TTL Setting)

ConOptics, Inc. 19 Eagle Road, Danbury, CT 06810 Phone [phone] Fax [phone]
Email: [e-mail], or visit www.conoptics.com
9
Model 25D Amplfier Electronics
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1 1Wednesday, October 08, 2008
Size Document Number Rev
Date: Sheet of
R47
470K,2W
C9
10uf
+
R30
27K
Q25
MJH11022
J2
R49
50,250W
R58
10K
L4
VK200
R77
3,5W
R60
10K
R53
4.3KQ16
2N4957
Q28
2N5416
R48
470K,2W
R78
3,5W
R16
39,2W
R6
1K
R26
2K,1W
C17 .01
R22
39,2W
C23
10UF +
R52
4.3KR1
50
J6
L3
VK200
C29
10UF
+
C25
10UF
+
C5
.01
R5
910
J1
VR2
1N823
R62
3.9K
C?
4.7UF
C14
10UF
+
Q5
2N5583
2
2
1
1
3
C28
10UF
+
SW1
2
1 3
5
4 6
Q20
2N5416
Q30
VN50300L
C20
10UF
+
C22
.01,1KV
U1
OP77
3
2
6
7 1
4 8
+
-
Q14
MRF148
Q17
VN50300L
C?
.01
R8
100
R42
36,1/2W
Q15
MRF148
Q21
2N5416
R79
33K,1/2WR83
390,2W
R17
100
R1250
R43
36,1/2W
VR13 1N914
VR16
1N5956
R20
100
R9
430
C30
1UF
VR14
1N5956
C26
10UF
-
Q13
2N5583
VR9
1N823
L1
VK200
VR15
1N5956
R35
390,2W
R36
390,2W
Q3
2N5583
Q22
2N3906
VR17
1N5956
VR5
1N823
R61
1K
Q7
2N5583
Q19
MPSA44
C27
10UF
+
VR8
1N823
FRONT PANEL POT
10K
R34
51
F1
FUSE THERMAL
R38 51
C?
.01
R56
560K,2W
Q11
2N5583
R66
51
U2
LH0022
3
2
6
7 1
4 5
+
-
R73
56K
R23
1.2K,1W R57
10K
R29
1K
R2827K
J3
R51
100
U3B
74S140
9
10
12
13
8
R46
82
C13
10UF
+
R85
1K
VR4
1N823
U3A
74S140
1
2
4
5
6
R11
12
Q23
2N3906
R84
390,2W
R13
7.5
Q4
2N5583
J?
Q9
MRF896
R2
51
R80
5.1K
Q6
2N5583
R63
3.3K
R44
1.6K,1/2W
VR11
UA7805
IN
1
GND
2
OUT 3
R21
51
C?
.01
Q1
2N4957
Q10
2N5109
R65
10K
R17
51
SW? REAR PANEL SWITCH
VR3
1N4739
R81
10M
R65
51
R7
1.8K
Q8
MRF896
R39
36,1/2W
R82
10M
R3
2K,1W
R64
2K
R10
24,2W
C16
10UF
+
R54
10M
R40
36,1/2W
R55
10M
C15
10UF
+
R19
1.2K,1W C35
.01
C?
510PF
R76
VR1
1N823
VR6
1N4740
R87
24K,1/2W
R72
5.1K
C8
10UF
+
R25
220,2W
VR11
1N4736
C
510PF
VR12
1N823
Q24
2N3439
R24
220,2W
R33
13K
Q27
2N5416
C6
.01
R41
1.6K,1/2W
R31
13K
R50
50,250W
R4
24
L2 VK200
U4
108
3 2
6
7
1
4
8
+ -
VR7
1N4740
R27 24
R71
1.2K
C?
.01
Q2
MRF896
Q29
MPSA44
VR10
1N823
Q12
2N5109
R74
1.5K
R45
51
R66
20K
C33
.01
R15
220,2W
Q18
MPSA44
R86
10K
Q26
MJH11022
R32
51
R14
220,2W
L5
VK200
R83
50K
R37
51
J4-1, AC HIGH
J4-2, AC HIGH
J4-3, +5V
J4-4, +5V RETURN
J4-5, +28V
J4-6, -15V
J4-7, +28V RETURN
J4-8, +15V
J4-9, -550V RETURN
J4-10, +106V
J4-11, -550V
J4-12, +/-15V RETURN M25DS DRIVE ELECTRONICS
CONOPTICS INC. DANBURY, CT. 06810
+15
-15
-15
J1,OUTPUT
REAR PANEL
J2,TERMINATION
REAR PANEL
J3,MOD.BIAS
REAR PANEL
ANALOG
TTL
+15 -15
+28
+28-15
-550
+106
INTERNAL EXTERNAL
(INTERNAL DRIVE LEVEL ADJ )
+15
EXTERNAL DRIVE LEVEL INPUT
REAR PANEL
-15
TWEEKER INPUT
+15
COMMON MODE
DIFFERENTIAL BALANCE
+++
BIAS INPUT
GAIN ADJ.
INPUT ATTENUATOR
BIAS SHIFT
COMPENSATION
FILE # SCHLUM25DS
0 TO 7V MAX
short

ConOptics, Inc. 19 Eagle Road, Danbury, CT 06810 Phone [phone] Fax [phone]
Email: [e-mail], or visit www.conoptics.com
10
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1 1Thursday, April 06, 2006
Size Document Number Rev
Date: Sheet of
C2
+
R9
200
R3
470K
D1
Q2
MJE350
R2
50K
R7 100K
R1
3.3K
CR3
R5
6.8K
CR2
C3
+
Q1
MJE350
R8
100K
R4
100K
R6
6.8K
C1
100PF
CONOPTICS INC. DANBURY, CT. 06810
-550VDC BIAS SUPPLY
1W
12
11
5 6 4
13
7
9
U1
UA723
500V
30UF
30UF
500V
1/2W
1/2W
1N4742
5W
1N4007
1N4007
V+
Vc + -
VREF
COMP
V-
Vz
-550VDC
RED
BLK
J1
LP-12-2094
115
115
100
100
0
0